Does anyone have experience with the FAB Defense Tactic Skin Slide Cover? Does it really gives you a better grip by cocking and is it not a obstacle for the slide stop lever?
Can anyone tell me anything about it?

If you're having difficulty running the slide on a Glock, you likely need to work a bit on technique. When done properly, very little hand strength is required.
I'd be concerned that it might somehow affect reliable function as well. I've only seen pictures, but it's not something I'd use even if it were free.
s45

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